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Definition of Second crusade
1. Noun. A Crusade from 1145 to 1147 that failed because of internal disagreements among the crusaders and led to the loss of Jerusalem in 1187. 
Generic synonyms: Crusade
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1. Noun. A Crusade from 1145 to 1147 that failed because of internal disagreements among the crusaders and led to the loss of Jerusalem in 1187.